Make stronger crypto nearly as fast

One of the disadvantages of x25519 and ℘256 is it only provides 126 bits
of security, so that seems like a weak link in the chain, if we're using
ECDHE-ECDSA-AES256-GCM-SHA384. The U.S. government wants classified data
to be encrypted using a curve at least as strong as ℘384, which provides
192 bits of security, but if you read the consensus of stack exchange it
would give you the impression that ℘384 is three times slower.

This change (as well as the previous one) makes ℘384 three times as fast
by tuning its modulus and multiplication subroutines with new tests that
should convincingly show: the optimized code behaves the same way as the
old code. Some of the diff noise from the previous change is now removed
too, so that our vendored fork can be more easily compared with upstream
sources. So you can now have stronger cryptography without compromises.

℘384 modulus Justine                        l:         28𝑐          9𝑛𝑠
℘384 modulus MbedTLS NIST                   l:        127𝑐         41𝑛𝑠
℘384 modulus MbedTLS MPI                    l:      1,850𝑐        597𝑛𝑠

The benchmarks above show the improvements made by secp384r1() which is
an important function since it needs to be called 13,000 times whenever
someone establishes a connection to your web server. The same's true of
Mul6x6Adx() which is able to multiply 384-bit numbers in 73 cycles, but
only if your CPU was purchased after 2014 when Broadwell was introduced

third_party/mbedtls/ecdsa.c

@@ -28,31 +28,12 @@ Mbed TLS (Apache 2.0)\\n\
 Copyright ARM Limited\\n\
 Copyright Mbed TLS Contributors\"");
 asm(".include \"libc/disclaimer.inc\"");
-
 /* clang-format off */
-/*
- *  Elliptic curve DSA
- *
- *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- */
 
-/*
- * References:
+/**
+ * @fileoverview Elliptic curve Digital Signature Algorithm
  *
- * SEC1 http://www.secg.org/index.php?action=secg,docs_secg
+ * @see SEC1 http://www.secg.org/index.php?action=secg,docs_secg
  */
 
 #if defined(MBEDTLS_ECDSA_C)